The decrease in leukocytes after chemotherapy is caused by bone marrow suppression. When the decrease in leukocytes is found in the rechecked blood after chemotherapy, if the decrease is low and no uncomfortable symptoms appear at the same time, no special treatment is usually needed, and adequate nutrition can be maintained by eating more high-protein and easily digestible foods, such as milk, eggs and meat porridge, so as not to aggravate the weakness of the body. Although dietary regulation cannot help to raise the white blood cell values, it can prevent further aggravation of symptoms and thus promote recovery from symptoms. If the degree of leukocyte decline is more serious, you should promptly seek medical attention and follow medical advice to actively take oral medication. Clinical treatment for post-chemotherapy leukocytopenia is often given with oral medications such as licoquinone, vitamin B4, shark’s liver alcohol, and diethylstilbestrol tablets. In addition, patients with post-chemotherapy leukopenia also need to follow medical advice for anti-infection treatment, and pay attention to the observation of adverse reactions. It should be noted that post-chemotherapy leukocyte reduction is limited by oral medication. If the leukocyte value decreases too much, the recombinant human granulocyte-stimulating factor injection should be injected immediately according to the doctor’s prescription, which can effectively raise the leukocyte value. For some patients with obvious toxic side effects of chemotherapy, prophylactic leukocyte boosting treatment may be required 48 hours after chemotherapy, and the injection of long-acting leukocyte boosting injection, which is often used now, can well prevent the occurrence of leukocyte reduction after chemotherapy. If lowered white blood cell values are found after chemotherapy, care needs to be taken to reduce going outside to avoid getting cold which can lead to lowered resistance and thus infection. It is also important to note that after receiving treatment to promote leukocyte elevation, it is important to follow the doctor’s instructions to review blood tests to clarify the recovery of leukocytes so that further measures can be taken to speed up the recovery of the disease.